Hydraulic adapter The male half has a 30° seat with a straight thread, while the female has a 300 seat with a straight thread as well. This connection and the 37° Flare are alike, however it's 30° seat and BSPP-like thread dimensions make it different from the American 37° Flare.
JIS TAPERED PIPE THREAD
The hydraulic adapter Japanese tapered
pipe thread connector is identical to and interchangeable with the BSPT
(tapered) connector. The Japanese male thread does not have a 30° Flare, and
will not mate with the BSPP female swivel with conical seat.
The seal on the Japanese tapered pipe thread connector is made on the threads. Use of a thread sealant is recommended.
Thread form per JIS B 0203 (identical to BSPT)